mirror of https://github.com/bazelbuild/rules_cc
117 lines
3.4 KiB
Bash
Executable File
117 lines
3.4 KiB
Bash
Executable File
#!/bin/bash
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#
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# Copyright 2015 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# OS X relpath is not really working. This is a wrapper script around gcc
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# to simulate relpath behavior.
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#
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# This wrapper uses install_name_tool to replace all paths in the binary
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# (bazel-out/.../path/to/original/library.so) by the paths relative to
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# the binary. It parses the command line to behave as rpath is supposed
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# to work.
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#
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# See https://blogs.oracle.com/dipol/entry/dynamic_libraries_rpath_and_mac
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# on how to set those paths for Mach-O binaries.
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#
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set -eu
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GCC=/usr/bin/gcc
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INSTALL_NAME_TOOL="/usr/bin/install_name_tool"
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LIBS=
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LIB_DIRS=
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RPATHS=
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OUTPUT=
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function parse_option() {
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local -r opt="$1"
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if [[ "${OUTPUT}" = "1" ]]; then
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OUTPUT=$opt
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elif [[ "$opt" =~ ^-l(.*)$ ]]; then
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LIBS="${BASH_REMATCH[1]} $LIBS"
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elif [[ "$opt" =~ ^-L(.*)$ ]]; then
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LIB_DIRS="${BASH_REMATCH[1]} $LIB_DIRS"
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elif [[ "$opt" =~ ^-Wl,-rpath,\@loader_path/(.*)$ ]]; then
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RPATHS="${BASH_REMATCH[1]} ${RPATHS}"
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elif [[ "$opt" = "-o" ]]; then
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# output is coming
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OUTPUT=1
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fi
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}
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# let parse the option list
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for i in "$@"; do
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if [[ "$i" = @* ]]; then
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while IFS= read -r opt
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do
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parse_option "$opt"
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done < "${i:1}" || exit 1
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else
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parse_option "$i"
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fi
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done
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# Call gcc
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${GCC} "$@"
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function get_library_path() {
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for libdir in ${LIB_DIRS}; do
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if [ -f ${libdir}/lib$1.so ]; then
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echo "${libdir}/lib$1.so"
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elif [ -f ${libdir}/lib$1.dylib ]; then
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echo "${libdir}/lib$1.dylib"
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fi
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done
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}
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# A convenient method to return the actual path even for non symlinks
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# and multi-level symlinks.
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function get_realpath() {
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local previous="$1"
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local next=$(readlink "${previous}")
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while [ -n "${next}" ]; do
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previous="${next}"
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next=$(readlink "${previous}")
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done
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echo "${previous}"
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}
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# Get the path of a lib inside a tool
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function get_otool_path() {
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# the lib path is the path of the original lib relative to the workspace
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get_realpath $1 | sed 's|^.*/bazel-out/|bazel-out/|'
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}
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# Do replacements in the output
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for rpath in ${RPATHS}; do
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for lib in ${LIBS}; do
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unset libname
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if [ -f "$(dirname ${OUTPUT})/${rpath}/lib${lib}.so" ]; then
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libname="lib${lib}.so"
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elif [ -f "$(dirname ${OUTPUT})/${rpath}/lib${lib}.dylib" ]; then
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libname="lib${lib}.dylib"
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fi
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# ${libname-} --> return $libname if defined, or undefined otherwise. This is to make
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# this set -e friendly
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if [[ -n "${libname-}" ]]; then
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libpath=$(get_library_path ${lib})
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if [ -n "${libpath}" ]; then
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${INSTALL_NAME_TOOL} -change $(get_otool_path "${libpath}") \
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"@loader_path/${rpath}/${libname}" "${OUTPUT}"
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fi
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fi
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done
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done
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